Insulating sleeve



FIG. 1 is a perspective view of the insulating sleeve showing a new ornamental design thereof;

FIG. 2 is a front view of the insulating sleeve shown in FIG. 1;

FIG. 3 is a back view of the insulating sleeve shown in FIG. 1;

FIG. 4 is a bottom view of the insulating sleeve shown in FIG. 1;

FIG. 5 is a top view of the insulating sleeve shown in FIG. 1;

FIG. 6 is a right side view of the insulating sleeve shown in FIG. 1; and,

FIG. 7 is a left side view of the insulating sleeve shown in FIG. 1.

The broken lines shown in the drawings are understood to represent stitching. 

CLAIM The ornamental design for insulating sleeve, as shown and described. 